I have a '91 SB-2 as well, love it. That P is super-hot, it's the loudest of all my basses, active or passive. Turn down its volume! Micro-tilt is the adjustment at the neck pocket to change the neck angle - you get at the adjuster through the little hole at the pointy part of the neck plate. If you can slip a thin piece of paper under the heel at all, then the micro-tilt is engaged. Search out the G&L setup manual online for better detail, but you basically loosen the screw near the adjuster a little, and loosen the other two screws a little less. Then using the appropriate allen wrench, turn the m-t adjuster a very small amount (a little goes a long way). You might hear it clunk. Clockwise increases angle. Then kinda shift the neck around to get it settled and slowly tighten the screws in the reverse order. Don't crank the cr@p out of them, but of course make sure they're tight. Of my 3 G&Ls, to get my preferred action I need a little micro-tilt in 2 of them (one being my '91 SB-2). Not much, though.